gmt2rgb(1gmt) on Linux
The text f93fff3d3d7d, as Debian 5.0 (Lenny) shipped it.
Converting a grid file, a raw, or a Sun raster file to r/g/b grids
Flags it lists
-
-C -
-F -
-G -
-I -
-L -
-R -
-V -
-W